Here's a close-up of the leaves. It gets small purple flowers as well.

Vitex negundo aka Vitex incisa var. heterophylla

That looks right. Thanks heaps.

Looks suspiciously like vitex agnus-castus. The variety "Shoal Creek" is common in the trade. Known as chaste tree or chaste berry or Texas Lilac. There's a pinkish variety as well, but the name escapes me. It SHOULD be fast growing. And they also get huge, unless you live in area that's cold enough that it dies back to the roots and behaves like a perennial instead of a shrub. Here in z7a, I prune mine back severely each Spring (it blooms on new growth), and it bounces back and blooms for several months.

Here is a link that might be useful: Images for V. Shoal Creek

opps...Saltcedar is probably right about the species. I didn't look at the second pic. The leaves aren't right for V. a-c